Road Links

Existing External Linkages of the Province

The province of Isabela has eight (8) existing road networks that link to its neighboring provinces. These are the Cordon-Santiago-San Pablo Road (Daang Maharlika), Cordon-Diffun Road, Santiago-Baluarte-Quirino Boundary Road, Santiago-Tuguegarao Road, Junction National-Potia Road, Santiago-Abut, Quezon-Agbannawag Road (Tabuk City) and Roxas-Paracellis Road.

The major trunkline that links Isabela to its neighboring provinces is the Cordon-Santiago-San Pablo Road or Maharlika Highway. This is complemented by the Santiago-Tuguegarao Road which lessens the travel time by an hour to and from Isabela to Cagayan, Kalinga and Apayao provinces via the western side of the province. These roads serve as the main thoroughfare for transporting the agriculture produce of the province to its neighboring provinces and the National Capital Region.

Along the eastern part of Isabela, there are 3 existing routes leading to the provinces of Quirino and Aurora in Region 03. These are the Cordon-Diffun Road, Junction Ipil-Quirino Road and Santiago-Baluarte-Quirino Boundary Road. Other routes which link Isabela to the Province of Ifugao, Kalinga and Mountain Province in Cordillera Administrative Region (CAR) are Junction National-Potia road, Santiago-Abut, Quezon-Agbannawag Road (Tabuk City) and Roxas-Paracellis Road, respectively.

Of these road networks, portions of the Cordon-Santiago-San Pablo Road or Maharlika Highway are prone to road closures particularly during the onslaught of typhoons and flooding. A short portion of the road in the city of Ilagan is prone to road sinking while the bridge in the municipality of San Pablo is prone to flooding. The closure of the road network would halt the flow of traffic and paralyze the economic activity of the province.

Internal Circulation Routes of the Province

Internal circulation routes are of great importance because it will provide linkage and access to the municipalities of Isabela. To date, the province has four (4) existing circulation routes that link its neighboring municipalities. These are the Cauayan-Cabatuan Road, Gamu-Roxas Road, Naguilian-San Mariano Road and Alicia-San Mateo Road. These roads likewise provide easier access to the comercial, institutional and production areas as well as government centers of the  province.